Revert linux.g5.4xlarge.nvidia.gpu runner

Author: mansnils

.ci/scripts/test_backend.sh

@@ -60,8 +60,6 @@ if [[ "$FLOW" == *arm* ]]; then
 
     # Setup ARM deps.
     if [[ "$FLOW" == *vgf* ]]; then
-        # Vulkan-SDK required for VGF backend
-        source .ci/scripts/setup-vulkan-linux-deps.sh
         .ci/scripts/setup-arm-baremetal-tools.sh --enable-mlsdk-deps --install-mlsdk-deps-with-pip
     else
         .ci/scripts/setup-arm-baremetal-tools.sh

.github/workflows/trunk.yml

@@ -294,7 +294,7 @@ jobs:
           - test_arm_baremetal: test_model_smollm2-135M
       fail-fast: false
     with:
-      runner: linux.g5.4xlarge.nvidia.gpu
+      runner: linux.2xlarge.memory
       docker-image: ci-image:executorch-ubuntu-22.04-arm-sdk
       submodules: 'recursive'
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}